#!/usr/bin/env bash

# This setup script should do the minimum work required to download the release package, unzip it, and kick off the
# setup script contained within.

# exit when any command fails
set -e

if [ "$(id -u)" == "0" ]; then
   echo "This script must not be run as root" 1>&2
   exit 1
fi

check_command() {
    if ! command -v "$1" &>/dev/null; then
        echo "Please install \"$1\" and make sure it's available in your \$PATH, then rerun the setup."
        exit 1
    fi
}

check_command "curl"
check_command "gnome-shell"

ARCH=$(uname -m)
FILE_NAME="breezyGNOME-$ARCH.tar.gz"
GNOME_VERSION=$(gnome-shell --version | cut -d' ' -f3 | cut -d'.' -f1)
VERSION_SPECIFIC_FILENAME="breezyGNOME-$GNOME_VERSION-$ARCH.tar.gz"
LATEST_RELEASE=$(curl -s "https://api.github.com/repos/wheaney/breezy-desktop/releases/latest")
if echo "$LATEST_RELEASE" | jq -e --arg filename "$VERSION_SPECIFIC_FILENAME" '.assets[] | select(.name == $filename)' > /dev/null; then
  echo "Performing setup for GNOME $GNOME_VERSION ($ARCH)"
  FILE_NAME=$VERSION_SPECIFIC_FILENAME
elif [ "$GNOME_VERSION" -lt 45 ]; then
  echo "Performing setup for GNOME 44 and below ($ARCH)"
  FILE_NAME="breezyGNOME-44-max-$ARCH.tar.gz"
else 
  echo "Performing setup for GNOME 45 and up ($ARCH)"
fi

start_dir=$(pwd)

# create temp directory
tmp_dir=$(mktemp -d -t breezy-gnome-XXXXXXXXXX)
pushd $tmp_dir > /dev/null
echo "Created temp directory: ${tmp_dir}"

binary_download_url="https://github.com/wheaney/breezy-desktop/releases/latest/download/$FILE_NAME"
if [ "$1" = "-v" ]
then
  metrics_version="$2"
  binary_path_arg="$3"
elif [ "$1" = "--tag" ] && [ -n "$2" ]
then
  binary_download_url="https://github.com/wheaney/breezy-desktop/releases/download/$2/$FILE_NAME"
else
  binary_path_arg="$1"
fi

if [ -z "$binary_path_arg" ]
then
  # download and unzip the binary
  echo "Downloading to: ${tmp_dir}/$FILE_NAME"
  curl -L "$binary_download_url" > "$FILE_NAME"
else
  FILE_NAME=$(basename $binary_path_arg)
  if [[ "$binary_path_arg" = /* ]]; then
    abs_path="$binary_path_arg"
  else
    # Convert relative path to absolute path
    abs_path=$(realpath "$start_dir/$binary_path_arg")
  fi
  cp $abs_path $tmp_dir
fi

echo "Extracting to: ${tmp_dir}/breezy_gnome"
tar -xf $FILE_NAME

pushd breezy_gnome > /dev/null

# run the setup script that comes with this release
bin/setup $metrics_version

echo "Deleting temp directory: ${tmp_dir}"
rm -rf $tmp_dir
cd "$(dirs -l -0)" && dirs -c